ci: add gitea image publishing workflows

build.gradle.kts

@@ -14,7 +14,7 @@ plugins {
 apply(plugin = "org.springframework.boot")
 
 group = "at.dslan"
-version = "0.1.0"
+version = file("VERSION").readText().trim()
 
 java {
     toolchain {
@@ -40,3 +40,14 @@ dependencies {
 tasks.withType<Test> {
     useJUnitPlatform()
 }
+
+tasks.register<Copy>("stageFatJar") {
+    group = "build"
+    description = "Copies the boot jar to a stable location for CI image assembly."
+    dependsOn("bootJar")
+    from(layout.buildDirectory.dir("libs")) {
+        include("*.jar")
+    }
+    into(layout.buildDirectory.dir("ci"))
+    rename { "server.jar" }
+}